Rebuilding during make install process

[Patrice Dumas]

> It's basically relinking libguile for it's own purposes.

My understanding is that the linking done during lake is against libraries
within the package. So libguileopts is linked against a local libopts.
It allows, for example to run tests. Therefore, while installing, libtool 
relinks the libguileopts library against the installed libopts.

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Pat